Two dispersion-distance models miss the known acceleration flag in J1024-0719 in an ATNF 2.9.0 screen

We screen 228 field pulsars with periods below 30 ms, positive observed period derivatives, and complete proper motions in ATNF 2.9.0. Each dispersion-distance model gives 14 nominal transverse-motion flags; ten sources are in both lists. Neither list contains the known wide-binary pulsar J1024-0719. Its catalogue parallax instead gives a maximum total line-of-sight acceleration of -1.50e-9 m/s2. A conservative three-error corner gives -1.22e-9 m/s2. Only this source retains a negative limit among 59 sources with parallax greater than three errors. A direct Gaia DR3 query for its published optical companion gives limits of -1.98e-9 and -3.97e-10 m/s2. This check assumes that the published counterpart association is correct. The result is a test of a search filter, not a new binary discovery. The two model distances must not be required to agree on a flag before parallax-based follow-up. Distance errors, timing fits, Galactic acceleration and catalogue errors limit the other flags. Code, frozen catalogue values, provenance, figures and offline steps are included.

astronomy · pulsars · Shklovskii effect · distance models · Gaia DR3 · J1024-0719 · null discovery result